# SDR UALA2012122107351

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 20, 2012
- Submitted: January 28, 2013
- Operation: Air carrier
- Aircraft: [N221UA](https://openairdocs.org/aircraft/N221UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30552
- Aircraft time: 48,354 hours, 6,035 cycles
- Engine: Pwa PW40903
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Radio
- Condition: Malfunctioned
- Location: Hf System
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012122107351

## Discrepancy

HF RADIO TRANSMISSION PROBLEM.  RT HF WILL NOT TUNE.  CYCLED RT HF THRU FREQ 3.000 TO 15.000MHS IN 1 MHZ STEPS.  CHECKED THAT NORMAL TUNE TONE AND TRANSMISSION EACH STEP.  CHECKED RX WITH WWV AT 5.000, 10.00 0 MHZ.  RT HF CHECKS OK PER MM.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.